Culvert



Patented Se t. 2 1930 uuiso 'SATET'S' PATENT OFFICE HARRY HUTGEINSON, or CANTON, 01110, ASSIGNOR, BY MESNE ASSIGNMENTS, r THE manners. MANUFACTURING company, or cannon, 0310, A conronarron OF-NEW JERSEY CULVERT A Application filed men, 1928. Serial No. 247,438.

This invention relates to new and useful lmprovementsin corrugated culverts, such as are commonly employed beneath roadways, railway. tracks, and the like, or in the,

5 construction of sewers, conduits, and similar structures. As is well known, corrugated metal culvert-s are subject to destructive. forces, such as erosion or abrasion, which exert their maxi lomum effect on the bottom or stream-carrying portion of the culvert. The water stream traversing the lower portion of the interior of the culvert carries, both mechanically and in suspension, solid matter, such as sand, silt, and gravel, and these, in time, erode'or abrade the metal of the culvert to such an extent as to render the culvert unfit for further use.

Any object of: the present invention is the provision of a corrugated culvert section, 2 which'can be easily fabricated, can be readily vjoined to similar sections for the purpose of forming a culvert of any-desired length, and in which certain detailsof construction are incorporated, which will enable the culvert to have a much longer life than has heretofore been attainable, by virtue of its prolonged ability to withstand the aforesaid'factors of erosion or abrasion;

Another object of the invention is the prom vision of a corrugated culvert which shall be capable of withstanding the strains of expansion, contraction, and deflection to a greater degree than the ordinary type of corrugated culvert. 7

llhese and other objects of the invention will become more readily apparent in the course of the following description of the invention, taken in connection with the accompanying'drawing, wherein Fig. 1 is a perspective view of a culvert secrugatedmetal, having its sides 5 and 6 overlapped to a considerable extent, as shown in Fig. 1, to provide a double-walled lower portion. The marginal edges 7 and 8 of the sides of the sheet are secured to the body of the culvert section by means of rivets i), and the corrugations of the overlapped sides nest [within each other, so that little if any space is leftbetween the contiguous faces of the overlapped sides, and in order to avoid the entrance. of Water or other fluid between the overlapped sides, a layer or coating of sealing material 10, such for example as'tar, asphalt,

tarred paper, sheet rubber,'sheet lead or the like is preferably applied or placed between the overlapped sides in any desired manner, as clearly shown in Figs. 1 and 2.

' The height of the double-walled lower ation of the culvert section, as indicated by the letter H in Fig. 3, should not be less thanone-third of the overall height or diameter of the culvert section,- but need not'in any case-exceed two-thirds of the overall height or diameter.

As shown in Fig. 3 a plurality of culvert I sections may be joined to each other in end to end arrangement, as by rivets 11, to pro-' vide a complete culvert.

It is obvious that a culvert or culvert sec tion, made'in accordance with the present invention, will have from two to four times the life of the ordinary type of full circle 1 After the inner lapped corrugatedculvert.

side 5 has become entirely eroded, the outer lapped side 6, which remains securely held to the body of the culvert by means of the second row of rivets 9, becomes exposed'to erosion, and the culvert literally begins a new period of life. a

In cases where a layer of tar or other sealingmaterial is interposed between the inner and outer lapped sides 5 and 6, such material must be entirely eroded before the outer lapped side 6 is attacked, and in this manner, the life of the culvert is still further increased.

The double-walled construction of the lower portion of the culvert section also enables the culvert'to resist the strains of expansion, contraction, and deflection to a greater degree than the ordinary type of full circle corrugated culvert.

Having described my invention, what I claim is: v

1. A cylindrical culvert section formed from a single sheet of metal having its sides overlapped to provide a double-wall at its lower portion only, the walls comprising said lower portion being permanently secured to each other at their marginal edges, so that after the inner overlapped side has become entirely eroded by passage of water through the lower portion of the culvert section, the outer overlapped side will remain, securely held to the body of the culvert section.

2. A culvert comprising sections as defined in claim 1, connected to each other in end to end arrangement, the lower portions of the sect-ions being in alignment with each other.

plural layers of corrugated metal extending along an are less than acomplete circle, the

corrugations of which nest within each other and the layers of metal being permanently secured to each other at their marginal edges, so that after one of the layers has become entirely eroded by passage of water through the lower portion of the culvert section, the other layer will remain securely held to the body of the culvert section.

4. A culvert comprising sections as defined in claim 3, connected to each other in end to end arrangement, the lower portions of the sections being in alignment with each other.

5. A cylindrical culvert section formed from a single sheet of corrugated metal having its sides overlapped to provide a doublewall at its lower portion only with the corrugations of one of the overlapped sides nesting within the corrugations of the other overlapped side, the walls comprising said lower portion being permanently secured to each other at their marginal edges, so that after the inner'overlapped side has become entirely eroded by passage of Water through the lower portion of the culvert section, the outer overlapped side will remain securely held to the body of the culvert section.

6. A culvert comprising sections as defined in claim 5, connected to each other in end to end arrangement, the lower portions of the sections being in alignment with each other.

7. A cylindrical culvert section having a lower portion comprising .plural layers of metal extending along an are less than a complete circle which are permanently secured to each other at their marginal edges, so that culvert section.

In testimony whereof I affix my signature.

HARRY HUTCHINSON. 

